[InstCombine] (~A | B) & (A ^ B) -> ~A & B

This is part of a set of 2-variable logic optimizations
suggested here:
https://lists.llvm.org/pipermail/llvm-dev/2021-December/154470.html

The 'not' op must not propagate undef elements of a vector,
so this patch creates a new 'full' not, but I am not counting
that as an extra-use restriction because it should get folded
with the existing value by CSE.

https://alive2.llvm.org/ce/z/7v65im